That sure is going to spawn a hell of a lot of 'For Want Of A Nail' fics where either Hashirama killed himself and Madara led the united clans, or Madara became either the first or second Hokage as Hashirama wanted.

But still, this shit is WAY too slow. If there's one thing I hate it's overly extended flashbacks. They should be short and to the point. Get to the end of the fight!